156 BUDS AND STIPULES 



pass quickly from triangular to more decidedly sub- 

 ulate forms, which are more or less revolute at the tip. 

 They are followed by a few more which are linear, 

 with a subulate base, and revolute at the tip. 



These scales with revolute tips are followed by a 

 dense mass of others which are subulate-linear, acumi- 

 nate, straight, and closely adpressed to the bud. 



If a large terminal bud is taken, and the scales 

 removed, it will be seen that the bud includes the whole 

 of the plan of growth for the two succeeding years (fig. 

 274). The scales themselves are the primary leaves of 

 next summer's shoot ; and their obovate, persistent bases 

 constitute the persistent scales upon the primary axis. 



In the axils of these persistent portions, which are 

 green in winter, we find the axillary buds which go to 

 form the secondary shoots upon the resumption of 

 growth in spring. In those buds containing male 

 catkins, the latter are equivalent to axillary shoots, and 

 occupy the lower portion of the axis of the bud ; while 

 the perfect leaves are similarly accommodated, but 

 higher up the axis of the large resting winter-bud. 



At the apex of this bud we find two or more rela- 

 tively large ones, which are the resting buds of the 

 succeeding year. The scales covering them are already 

 testaceous, but await the following summer before 

 making further progress. 



Thus the primary leaves of two seasons' growth 

 take part in the composition of the winter-bud. 



